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People who know about fluid mechanics: why does a spoonful of honey stay more solid when you move it, but only if it isn't touching anything else?
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Let me explain. I'm pretty high right now so idk if this will come out entirely legible, but here we go.

Honey is (obviously) very drippy and sticky, but it's a lot thicker than water. When you take a spoonful of honey or a similar liquid, you lift the spoon quickly and spin it once or twice, and there's some force (I don't know which one!) that keeps the honey on the spoon when you move it. Then you can have your spoonful of honey without honey dripping everywhere.

BUT: when you do this little "spin the spoon so the honey stays on" trick and the spoon is touching anything else, the force is suddenly not enough to keep the honey in place, and your honey falls off the spoon. So, for example, I get honey in jars, so I use a teaspoon to take a spoonful of honey when I need it. But when my spoon is touching the side of the jar and I try to take a spoonful, the viscosity doesn't hold the same way it would if my spoon isn't touching anything, and the honey dollop falls back in.

Why does this happen? I know it might be something to do with honey being a non-Newtonian fluid, but I haven't studied mechanics in many years and never studied fluids so I don't know enough to figure this out.

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2 years ago